What limits does the torah have as a historical source

The Torah may seem to present a unified account of Israelite history and law during the patriarchal and Mosaic periods. Detailed study of the text, however, has led modern critical scholarship to theorize that the Torah is a compilation from several sources, different streams of literary traditions that were composed and collected over the course of the biblical period (ca. 1200 to ca. 400 B.C.E.). Because the Torah, in this perspective, is an amalgam of the works of different authors or schools, it contains an abundance of factual inconsistencies; contradictory regulations; and differences in style, vocabulary, and even theology. 

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